Woodworking-machine.



W. G. STROZIER.

WOODWORKING MACHINE.

APPLICATION FILED JUNE 26,1915.

1, 1 97., 96 Y Patented Sept. 12, 1916.

3 SHEETS-SHEET I.

Witnesses I W m a Attorneys,

W. G; STROZIER.

WOODWORKING MACHINE.

APPLICATION mzn JUNE 26. 1915.

Patented Sept. 12, 1916.

3 SHEETSSHEET 2 A I III fl .m 0 x 6 7 f 4 1 .7

Inventor T A mu Wit nesses Attorneys,

W. G. STROZIER.

'WOODWORKING MACHINE.

PLICATION FILED JUNE 26. 1915.

1|. ,1 97,96. Patented Sept. 12,1916.

EETS-SHEET 3.

Witnesses F I. Attorneys,

WEBSTER G. STROZIER; OF WASHINGTON, DISTRICT OF COLUMBIA, ASSIGNOR TO THE OF WASHINGTON, DISTRICT OF WOODWORKING MACHINE.

Specification of Letters Patent.

Patented Sept. 12, 1916.

Application filed June 26, 1915. Serial No. 36,462.

To all whom it may concern Be it known that I, VVEBsTnR G. S'rnozlnn,

tails substantially semi-circular in cross sec-' tional contour can be produced and correspondingly shaped grooves or recesses also formed so that by inserting the dovetails into the grooves, they will fit snugly therein and an eflicient connect on between two parts will thus be provided.

A further ob ect is to provide a machine which is capable of producing the dovetails and the grooves in separate parts at one operation so that the proper matching of the parts will be insured.

A further object is to provide improved means whereby the rounding of the dovetails transversely is elfected so as to allow said dovetails to fit snugly within the grooves provided therefor.

lVith the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combi-. nation and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes. in the precise embodiment of the invention herein disclosed, can be made within the scope of what is claimed, without departing from the spirit of the invention.

In the accompanying drawings the preferred form of the invention has been shown.

In said drawings: Figure 1 is an end elevation of that portion of a wood working machine constituting the present invention. Fig. 2 is a view partly in plan and partly in section of a portion of the machine. Fig. 3 is a section on line AB Fig. 2. Fig. 4 is an elevation of a portion of the shifting lever and the parts cooperating therewith,

the same being shown in the positions as sumed thereby when the cutters of the machine are at one limit of their adjustment longitudinally of the machine. Fig. 5 is a view similar to Fig. ,4 and showing the relative positions of the parts upon the completion ofthe first step involved in effect ing the shifting of the cutters toward the other limit of their adjustment. Fig. 6 is a view slmilar to Fig. 5 and showing the next step involved in such movement of the cutters. Fig. 7 is a view similar to Fig. 6 and showing the relative positions of the parts when the cutters are brought to an intermediate position prior to being brought to the other limit of their adjustment. Fig. 8 is an elevation of the cutter actuating cam and showing a stud in engagement therewith, said stud beingshown in the position assumed thereby when the cutters are at one limit of their adjustment, and the adjusting lever-and its adjacent parts are in the posi tions shown in F1g. at. Fig. 9 1s a view snnilar to Fig. 8 and showing the relative positions of the cam and stud when the cutters are in their intermediate position and the adjusting lever is in the position shown in Fig. 7. Fig. 10 is a. view similar to Fig. 9 and showing the relative positions of the cam and stud when the cutters reach the other limit of their adjustment. Fig. 11 is a section through two pieces of stock together and showing a continuous recess cut thereinto to form tongues upon one piece of the stock and grooves or recesses in the other piece of stock. Fig. 12 is a section on line CD Fig. 11, and showing the shapes of the tongues and grooves or recesses when-the cutters are brought to their intermediate position. Fig. 13 is a view similar to Fig. 12 and showing the shapes of the tongues and groovesor recesses upon the completion of the movement of the cutters from one limit to the other of their adjustment. Fig. 11 is a perspective view of a portion of one member of the joint. Fig. 15 is a perspective view of theother member of the joint.

Referring to the figures by characters of reference 1 designates the bed or base of the machine above which a table 2 is supported in any suitable manner, this table carrying a slide 3 .on which a piece of stock indicated generally at S is adapted to be placed, it being understood that any suitable form of gage, not shown, may be adiustably fastened to the slide 3 so as to thrust against the stock. Standards 4 extend from the sides of the slide 3 and have arms extending therefrom, as indicated at 5, these arms carrying clamping means shown generally at 6, for holding a piece of stock S in an upstanding position, as shown in Fig. 1. Clamping means may also be carried between the standards 4 for gripping the piece of stock S. The two clamping means employed are preferably similar to those disclosed in Patent No. 1,141,365, issued to me on June 1, 1915, and it is not deemed necessary, therefore, to describe or illustrate the same in'detail.

Rack bars 7 are secured to the ends of the slide 3 and project beyond the table 2, at least one of these rack bars being detachably secured by means of screws 8 or the like extending through slots 9 in the lower edge portion of the rack, as shown in Fig.

7 1 so that by loosening the screws 8, the rack can be quickly lifted out of position. Each of the rack bars is slidably mounted within a guide bracket 10 so as to be held against upward movement out of mesh with a gear 11 thereunder. Each of these guide brackets has a detachable top plate, as shown at 11, so that the rack bar 7 thereunder and which is the one shown in Fig. 1, can be readily removed by detaching the top plate. Each of the top plates of the brackets 10 is preferably provided with a wear screw 12 which contacts with the top of the rack bar 7 thereunder, as shown in Fig. 3.

The two gears 11 are secured to and rotate with a shaft 13 journaled in suitable bearings 14 provided therefor and adjust ably connected to one end of the shaft 13 is a cam wheel 15, said wheel being held to the shaft by a set screw 16 or the like. Formed within the periphery of the wheel 15 is a transversely extending dovetail groove 17 and a straight guide groove 18 extends along the periphery of the wheel 15 for a desired distance from the groove 17.

Mounted within the dovetail groove 17 is a cam slide 19 having spaced closely lying guide grooves 20 and 21 each of which is adapted to register at one end with the groove 18. To effect this registration it is merely necessary to move the slide 19 toward one side or the other of the wheel 15. The guide grooves 20 and 21 diverge upwardly as shown particularly in Fig. 9.

A tongue 22 extends from one end of the 7' slide 19 and has a curved slot 23. Slidably mounted in this slot is a shifting pin 24 extending from an angular block 25 which is pivotally connected to the center of the outer side'of wheel 15, as shown at 26. This shifting pin 24 is held close to the side of the wheel 15 by a retaining strip 27 fastened to the side of wheel 15 and fitted closely to the-tongue 22. I

Pivotally connected to the outer side of wheel 15 is a shifting lever 28 the fulcrum of which has been indicated at 29. This shifting lever has a short arm 30 extending upwardly therefrom and close to the fulcrum 29 and pivotally mounted upon the angle portion of lever 28 is a bell crank lever 31. One arm of this bell crank lever is connected by a rod 32 to a small shifting lever 33 fulcrumed upon lever 28. A spring 34 is mounted on the rod 32 and bears at one end against a collar 35 on said rod and at its other end against a guide car 36 extending from lever 28. Thus the small lever 33 and the bell crank lever 31 are held normally in predetermined positions relative to lever 28.

Pivotally mounted upon the free end portion of the extension 30 of lever 28 is an arm 37 connected by a link 38 to one of the arms of bell crank lever 31. Thus it will be seen that by shifting lever 33 relative to lever 28, motion will be transmitted therefrom to the arm 37 and said arm caused to swing about its connection with the exten' sion 30.

' Extending longitudinally of the machine below the rack bars 7 and parallel with the shaft 13 is a guide bar 39 preferably formed with a longitudinal dovetail groove 40. Mounted to slide within this groove are dovetails 41 extending from sectional blocks 42. Each of these sectional blocks has a worm gear 43 mounted for rotation therein and projecting into a segmental recess 44 formed in that side of the block remote from the bar 39. Each of the worm gears 43 is secured to the stem of a cutter 45 designed for use in making dovetails. This cutter is preferably of the form disclosed in Patent #1,095,041, issued to me on April 28, 1914, and inasmuch as the specific construction thereof constitutes no part of the present invention, it is not deemed necessary to describe or illustrate the same in detail. It is merely necessary to state that the cutter 45 is so shaped that, when forced into stock, it will produce a dovetail groove or recess the end wall of which is rounded, as will be hereinafter pointed out. The number of sectional blocks 42 employed is equal to the number of cutters 45 to be used, one of these cutters being carried by each of the sectional blocks. The blocks are all arranged close together and in line and are of such thickness or are so spaced apart as to hold the cutters 45 at predetermined distances from each other. The blocks 42 are connected so as to move together. This connection is preferably made by means of a bar 46 secured to the blocks by screws 47 or the like. The bar projects under one of the rack bars 7 and is provided at its outer end with a stud 48 constantly seated in one of the grooves 18, 20 or 21. Extending in the opposite direction from said end of the bar 46 is a guide wing 49 slidably mounted within a longitudinally grooved guide 50 mounted on the bed or base 1. This guide 50 constitutes a bearing for the shaft 51 of a worm 52. This worm extends longitudinally of the machine and into the segmental recesses 44 and constantly meshes with the worm gears 43 carried by all of the sectional blocks 42. Consequently when the worm 52 is rotated, all of the gears 43 will be simultaneously operated. Shaft 51 may be driven in any suitable manner, as by means of a belt engaging a pulley 53.

As hereinbefore pointed out, the machine can be used both for making joints, such as used at the corners of drawers, boxes and the like, and for ornamenting wood and for various other purposes. When it is desired, for example, to form tongues and grooves at the ends of pieces of stock to be used in making drawers, the said pieces of stock indicated at S and S are placed in the clamps 4, 5, 6, so that the stock S will QX- tend across the edge of the stock S as shown in Fig. 3.

Assuming that lever 28 and the parts carried thereby and cooperating therewith are in the position shown in Fig. 1, and that stud 48 is in the upper end of groove 21, while pin 24 is in the upper end of slot 23, and assuming furthermore, that the cutters 45 are being rapidly rotated by the worm 52 and the gears 43, it will be apparent that when lever 28 is swung upwardly from the position shown in Fig. 1, it will come against the lower end of the guide strip 27 so as to cause the wheel 15 and the plate 19 to rotate together, thus shifting laterally against the stud 48 which will be moved in the direction indicated by the arrow in Fig. 8, and will finally assume a position within the groove 18 registering with the groove 21. During this lateral shifting of stud 48 a corresponding movement of bar 46 and blocks 42 will be set up, the curvature of the groove 21 being such as to cause the cutters to move laterally a distance corresponding to that between lines a and Z) in Fig. 12 and in the direction of the arrow in said figure.

As the stock is at the same time being shifted toward the cutters by reason of the engagement of gears 11 with racks 7, it will be obvious that this rotation of wheel 15 and guide plate 19 will result in the formation of tongues T on the stock S which have the cross sectional contour illustrated in Fig. 12 and in the formation of grooves or recesses R in the stock S, having the cross sectional contour illustrated in Fig. 12. The depth of the recesses R can be regulated in any desired manner. For example, any desired means may be provided for limiting the movement of the racks 7. When the wheel 15 has been rotated by the upward movement of lever 28, as described, the parts assume the positions illustrated in Fig. 4 wherein lever 28 is shown pressing against the end of guide strip 27. The position assumed by the stud 48 and the pin 24 upon the completion of the cut illustrated in Fig. 12, has been shown in Fig. 9. As soon as the parts have been brought to the positions shown in Figs. 4 and 9, the operator presses lever 33 toward lever 28 so as to swing arm 37 to the position shown in Fig. 5. The operator then reverses the movement of lever 28 while arm 37 is thus held, with the .result that the end of arm 37 comes against one corner portion of the block 25 and thrusts against said block so as to move it about its pivot 26 and relative to the wheel 15. This relative movement of the block 25 causes the pin 24 to move from the upper end of slot 23 to the lower end thereof, there by to shift the guide plate 19 to bring groove 20 into register with groove 18. Then pin 24 comes against the lower end of slot 23, the lever 28 becomes locked to the wheel 15, as shown in Fig. 6, with the result that, during the further downward movement of lever 28, said lever will cause the rotation of wheel 15. Consequently the stock will be moved away from the cutters and during such movement the stud 48 will pass from groove 18 into the groove 20 and be shifted laterally by the walls of said groove 20 and in the direction indicated by the arrow in Fig. 10, until said stud 48 reaches the upper end of the groove 20, as shown in Fig. 10. This last step in the operation results in moving the cutters in the direction of the arrow in Fig. 13 after the stock S has been withdrawn from the cutters, said cutters moving a distance represented by the space between the lines o and c in Fig. 13. As the stock S is receding from the cutters during this movement, the formation of the tongues T will be completed as shown in Fig. 13. Thus it will be seen that by two movements of lever 28 all of the dovetails and the grooves can be formed on the two pieces of stock. By placing new pieces of stock in the machine and repeating the operation hereinbefore described, tongues and grooves will be formed on them in the same manner as set forth.

It will be obvious that the tongues produced by means of this machine are substan tially semi circular in cross section, the inner end of each tongue being smaller than the outer end and said outer end being approximately of the same thickness as the stock S. When the stock is in the position shown in Fig. 11, the flat faces of the tongues T lie against the flat faces between the recesses R. By reversing thepositions of the stock S and S relative to each other, the tongues T can be fitted snugly within the recesses R "will be obvious by referring to Figs. 14 and 15. By removing the detachable rack bar 7 and the block 25, the bar 46 and all of the blocks connected thereto can be withdrawn from the machine and other blocks substituted therefor.

What is claimed is l. The combination with a revoluble cutter, of means for simultaneously shifting stock against the cutter and shifting the cutter transversely of the path of movement of the stock and along the plane of movement of the stock, the axis of rotation of the cutter being perpendicular to said plane of movement. y 2. In a wood working machine, a revoluble cutter, means for shifting stock against the cutter, and means for moving the cutter transversely of the path of the stock and along the plane of movement of the stock during a portion of the movement of the stock, the axis of rotation of the cutter being perpendicular to said plane of movement.

3. The combination with a revoluble cutter, of an actuating element, means operated by the movement oi. said element in op-. posite directions successively for feeding stock against and away from the cutter respectively, and means operated by said aetuating element during a portion of each movement of the stock, for shifting the cutting element transversely of the path of movement of the-stock and along the plane of movement of the stock, the axis of rotation of the cutter being perpendicular to said plane.

4:. The combination with a revoluble cutter, an actuating element, means operated by the movement of said element in opposite directions successively for feeding stock against and away from the cutter respectively, and means operated by said actuating element during a portion of each movement of the stock, for shifting the cutting element in the same direction transversely of the path of movement of the stock and along the plane of movement of the stock, the axis of rotation of the cutter being perpendicular to said plane 5. The combination with a. series of alining conical cutters and means for simultaneously rotating them about parallel axes, of a connection between the cutters, an actuating element, means operated by the back and forth movement of said element for feeding stock against and away from the cutters, respectively, and means for transmitting motion from said element to the connection for shifting the cutters transversely of the path of movement oil? the stock and in the plane of movement of the stock during a. portion of each movement of said stock, the axes of rotation of the cutters being perpendicular to said plane.

6. The combination with a revoluble eutter, of a cam wheel having a straight peripheral groove, a guide plate having diverging grooves, means upon the wheel and movable relative thereto for shifting the guide plate to bring either of said diverging grooves into register with the peripheral groove, a member connected to the cutter and constantly engaged within one oi. the grooves, stock feeding means movable with the wheel, an actuating element, and ineans cooperating with said actuating element for successively rotating the wheel and shifting the guide plate when said element is moved in either direction.

I 7. In a wood working machine, the combination with a feed table and means carried thereby for holding separate pieces of stock with their edges in lapped relation, of a cutter, an actuating element, means operated by said element when moved in opposite directions successively, for moving the stock against and removing it from the cutter respectively, and means operated by the actuating element for shifting the cutter transversely of the path of movement of the stock and along the plane of movement of the stock during a portion of each movement of the stock, the axis of rotation of the cutters being perpendicular to said plane.

8. In a. wood working machine the combination with a cutter mounted for sliding movement, of a cam wheel having a straight peripheral groove, a guide mounted to slide transversely of the periphery of the wheel and at one end of said groove, said guide having diverging grooves, a shifting pin engaging the slide and pivotally connected to the wheel, an actuating lever, an arm pivotally connected to the lever, and means for shifting the arm relative to the lever to actuate the shifting pin relative to the wheel, and means for limiting the movement of said pin relative to the wheel, said means lying in the path of the lever.

In testimony that I claim the foregoing as my own, I have hereto ailixed my signature.

WEBSTER G. STROZIER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

